| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] [conj] a [noun sg] | 1243 |
|
| 2 | must be [vb pp] [conj] [noun sg] | 48 |
|
| 3 | must be [vb pp] [conj] a | 46 |
|
| 4 | must be [vb pp] a [noun sg] | 21 |
|
